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Finding the Fourth Proportional to 885,689.40, 1,328,534.10 and 512,441.40

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Solution

The fourth proportional to 885,689.40, 1,328,534.10 and 512,441.40 is: 768,662.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    885,689.40 : 1,328,534.10 = 512,441.40 : x
  2. Step 2: Convert to fraction form
    885,689.40/1,328,534.10 = 512,441.40/x
  3. Step 3: Cross multiply
    885,689.40x = 1,328,534.10 × 512,441.40
  4. Step 4: Simplify right side
    885,689.40x = 680,795,874,151.74
  5. Step 5: Solve for x
    x = 680,795,874,151.74/885,689.40
  6. Step 6: Final answer
    x = 768,662.10

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.